Compilare: main.cpp: In function 'int main()': main.cpp:26:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%ld%ld",&n,&m); ^ main.cpp:64:9: warning: iteration 12 invokes undefined behavior [-Waggressive-loop-optimizations] b[i]=0; ~~~~^~ main.cpp:63:11: note: within this loop for(i=0;i<=12;i++) ~^~~~